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Thiabendazole is a custom pharmacy drug classified as an anthelmintic (anti-worm). As a strong fungicide and parasiticide it is used to prevent worms from growing or reproducing in the body. Thiabendazole is used to treat various infections caused by worms such as threadworm, whipworm, roundworm, pinworm, and trichinosis.


Your compounding pharmacist can compound thiabendazole into various forms of delivery. Thiabendazole may be given as a chewable tablet, suspension, or other form. Consult with your doctor regarding which form may be right for you. If you are prescribed a chewable tablet, be sure to fully chew the tablet before swallowing. Take this drug with a full glass of water. Follow your doctor's recommendations and directions precisely during your course. If you experience anything concerning, contact your doctor immediately.


Side effects may differ from one person to another depending on their body chemistry, age, health status or other reason. Always see your doctor if you experience a side effect that seems to be getting worse or persisting. Common side effects seen with the use of thiabendazole are:

  • Headache
  • Numbness
  • Dizziness
  • Drowsiness
  • Upset Stomach
  • Decrease in Appetite
  • Nausea and/or Vomiting
  • Diarrhea
  • Odd Urine Odor
  • Blurry Vision
  • Dry Eyes
  • Fever and/or Chills
  • Ringing in Ears
  • Appearance of Live Worms (in mouth or nose)

Severe Side Effects Overview:

Severe side effects are an unfortunate possible outcome when using any drug. If you experience anything that is concerning, feels severe, or is listed below, see your doctor immediately, or get medical attention at a healthcare center or facility at once. Some of the most common severe side effects are listed below. This list is not comprehensive.

  • Skin Rash
  • Seizures
  • Vision Changes
  • Jaundice
  • Behavior Changes
  • Personality Changes

Allergy Warning:

Some users may have an allergic reaction to this drug. Allergic reactions always require immediate medical attention. Get emergency medical attention at once if you experience anything that feels like an allergic reaction or anything listed below.

  • Hives
  • Closing of the Throat
  • Swelling (lips, tongue, or face)
  • Shortness of Breath


Do not take this drug without approval from your primary care doctor. If you are considering the use of thiabendazole in any form, schedule a complete medical review and consultation with your primary care doctor. Always follow your doctor's recommendations.

Thiabendazole is contraindicated for the following:

  • Hypersensitivity to Thiabendazole

Thiabendazole is possibly contraindicated for the following:

  • Abnormal Liver Function Tests
  • Liver Failure
  • Kidney Disease
  • Allergy to Benzimidazoles

Talk to your doctor before beginning use of thiabendazole if any of the aforementioned is relevant to you.

IMPORTANT NOTE: There are many diseases, conditions, and drug interactions that could possibly contraindicate the use of thiabendazole, so talk to your doctor about contraindications that may be relevant to you.

  • "It is rare to find health professionals who are so willing to educate the patient on what they need to know."

    Clair C. | West Hollywood, CA